diff --git a/sys/dev/gpio/acpi_gpiobus.c b/sys/dev/gpio/acpi_gpiobus.c
--- a/sys/dev/gpio/acpi_gpiobus.c
+++ b/sys/dev/gpio/acpi_gpiobus.c
@@ -300,6 +300,10 @@
 	DEVMETHOD(device_attach,	acpi_gpiobus_attach),
 	DEVMETHOD(device_detach,	acpi_gpiobus_detach),
 
+	/* Bus interface */
+	DEVMETHOD(bus_activate_resource,	bus_generic_activate_resource),
+	DEVMETHOD(bus_deactivate_resource,	bus_generic_deactivate_resource),
+
 	DEVMETHOD_END
 };